Comma usage
- Use a comma before a coordinating conjunction that separate two independent clauses (unless the independent clauses are very short).
Examples:
a). This math problem is so difficult for me to figure it out, but I will try my best to work on it.
b). He wanted to help me but I refused.
- Use a comma after an introductory word, phrase, or clause that comes before a main clause.
Examples:
a). Eventually, we finished our trip to China.
a). Eventually, we finished our trip to China.
b). After we finished our trip to China, we went to Mongolia next day.
c). Since I am an international student, it is hard for me to understand my professor completely.
c). Since I am an international student, it is hard for me to understand my professor completely.
- Use commas to separate things.
Example:
a). I love many makeup brands such as Chanel, Lancome, Bobbi Brown and La Mer etc.
- Use a comma to set off a nonrestrictive attributive clause.
Example:
a). Jenny has received her mother's letter, which makes her so surprised.
- Use commas around words, phrases, and clauses in the middle of the sentence when they are not essential to the meaning of the sentence.
Examples:
a). My father, however, he did not agree.
b). China, on the other hand, is developing very fast.
c). My father, who is a very kind man, always like to sing songs for me.
- Use commas before and after a quotation within a sentence.
Example:
a). My mother always said," The more you do, the more you can learn."
- Use a comma before an afterthought or contrasting element.
Example:
a). When we come across difficult problems, we should try our best to solve them, not avoid them.
- Use commas to set off geographical names, items in date,and professional titles.
Example:
a). My father was born on January 12, 1970, in a simple family.
Reference: http://leo.stcloudstate.edu/punct/comma.html
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